//
//  WBComposeTypeView.swift
//  SinaWeiBo
//
//  Created by Frank on 2017/9/26.
//  Copyright © 2017年 Frank. All rights reserved.
//
import UIKit
import pop
class WBComposeTypeView: UIView {
    // 关闭按钮约束
    @IBOutlet weak var closeButtonCenterXCons: NSLayoutConstraint!
    // 返回前一页按钮约束
    @IBOutlet weak var returnButtonCenterXCons: NSLayoutConstraint!
    
    @IBOutlet weak var scrollView: UIScrollView!
    /// 返回按钮
    @IBOutlet weak var returnButton: UIButton!
    /// 按钮数据数组
    let buttonsInfo = [["imageName": "tabbar_compose_idea", "title": "文字", "clsName": "WBComposeViewController"],
                       ["imageName": "tabbar_compose_photo", "title": "照片/视频"],
                       ["imageName": "tabbar_compose_weibo", "title": "长微博"],
                       ["imageName": "tabbar_compose_lbs", "title": "签到"],
                       ["imageName": "tabbar_compose_review", "title": "点评"],
                       ["imageName": "tabbar_compose_more", "title": "更多", "actionName": "clickMore"],
                       ["imageName": "tabbar_compose_friend", "title": "好友圈"],
                       ["imageName": "tabbar_compose_wbcamera", "title": "微博相机"],
                       ["imageName": "tabbar_compose_music", "title": "音乐"],
                       ["imageName": "tabbar_compose_shooting", "title": "拍摄"]
    ]
    /// 完成回调
    var completionBlock: ((_ clsName: String?)->())?
    // MARK: - 实例化方法
    class func composeTypeView()-> WBComposeTypeView {
        let nib = UINib(nibName: "WBComposeTypeView", bundle: nil)
        // 从xib加载完成视图，根视图控制器的view
        let  v = nib.instantiate(withOwner: nil, options: nil)[0] as! WBComposeTypeView
        // XIB 加载默认是 600 * 600
        v.frame = UIScreen.main.bounds
        v.setupUI()
        return v;
    }
    //显示当前视图
    /// oc 中的bloc 如果当前方法不能执行，通常使用属性记录，在需要的时候执行
    func show(completion: @escaping (_ clsName:String?)->())  {
        // 0> 记录闭包
        completionBlock = completion
        
        // 1> 将当前视图添加到
        guard let vc = UIApplication.shared.keyWindow?.rootViewController else {
            return
        }
        // 2> 添加视图
        vc.view.addSubview(self)
        // 3> 开始动画
        showCurrentView()
    }

    // MARK: - 监听方法
    func clickButton(selectedButton: WBComposeTypeButton) {
        print("点我了")
        // 1.判断当前显示的视图
        let page = Int(scrollView.contentOffset.x/scrollView.bounds.width)
        let v = scrollView.subviews[page]
        // 2.遍历当前视图
        // - 选中的按钮放大
        // - 未选中的按钮缩小
        for (i,btn) in v.subviews.enumerated() {
            // 1> 缩放动画
            let scaleAnim: POPBasicAnimation = POPBasicAnimation(propertyNamed: kPOPViewScaleXY)
            // x.y 在系统中使用CGPoint 表示，如果需要转换成id，需要使用NSValue包装
            let scale = (selectedButton == btn) ? 2 : 0.2
            scaleAnim.toValue = NSValue(cgPoint: CGPoint(x: scale, y: scale))
            
            // anim?.toValue = NSValue(cgPoint(x: scale, y: scale))
            scaleAnim.duration = 0.5
            btn.pop_add(scaleAnim, forKey: nil)
            
            // 2> 渐变动画 动画组
            let alphaAnim: POPBasicAnimation = POPBasicAnimation(propertyNamed: kPOPViewAlpha)
            
            alphaAnim.toValue = 0.2
            alphaAnim.duration = 0.5
            
            btn.pop_add(alphaAnim, forKey: nil)
            
            // 3> 监听最后
            if i==0 {
                alphaAnim.completionBlock = {_,_ in
                    //需要执行的回调
                    print("需要执行的回调")
                    self.completionBlock?(selectedButton.clsName)
                }
            }
        }
    }
    func clickMore()  {
        print("点击更多按钮")
        // 1> 将scrollView 滚动到第二页
        let offset = CGPoint(x: scrollView.bounds.width, y: 0)
        scrollView.setContentOffset(offset, animated: true)
        
        // 2> 处理底部按钮，让两个按钮分开
        returnButton.isHidden = false
        
        let margin = scrollView.bounds.width / 6
        
        closeButtonCenterXCons.constant += margin
        returnButtonCenterXCons.constant -= margin
        
        UIView.animate(withDuration: 0.25) {
            self.layoutIfNeeded()
        }
    }

    @IBAction func clickReturn() {
        // 1.将滚动视图滚动到第1页
        scrollView.setContentOffset(CGPoint(x:0, y:0), animated: true)
        // 2. 让两个按钮合并
        closeButtonCenterXCons.constant  = 0
        returnButtonCenterXCons.constant = 0
        UIView.animate(withDuration: 0.25, animations: {
            self.returnButton.alpha = 0
            self.layoutIfNeeded()
        }) { _ in
            self.returnButton.isHidden = true
            self.returnButton.alpha = 1
        }
    }
    // 关闭视图
    @IBAction func close() {
        // removeFromSuperview()
        hideButton()
    }
}
// MARK: 动画扩展
private extension WBComposeTypeView {
    // MARK: - 消除动画
    // 隐藏按钮动画
    func hideButton() {
        // 1. 根据contentOffect 判断当前显示的子视图
        let page = Int(scrollView.contentOffset.x/scrollView.bounds.width)
        let v = scrollView.subviews[page]
        // 2. 遍历v中的所有按钮
        for (i,btn) in v.subviews.enumerated().reversed() {
            // 1>  创建动画
            let anim: POPSpringAnimation = POPSpringAnimation(propertyNamed: kPOPLayerPositionY)
            // 2> 设置动画属性
            anim.fromValue = btn.center.y
            anim.toValue = btn.center.y + 400
            // 设置时间
            anim.beginTime = CACurrentMediaTime() + CFTimeInterval(v.subviews.count-i)*0.025
            // 3> 添加动画
            btn.layer.pop_add(anim, forKey: nil)
            // 4> 监听第0个按钮的动画，是最后一个执行的
            if i==0 {
                anim.completionBlock = { _,_ in
                    self.hidCurrentView()
                }
            }
        }
    }
    // 隐藏当前视图
    func hidCurrentView()  {
        // 1> 创建动画
        let anim:POPBasicAnimation = POPBasicAnimation(propertyNamed: kPOPViewAlpha)
        
        anim.fromValue = 1
        anim.toValue = 0
        anim.duration = 0.25
        
        // 2>添加到视图
        pop_add(anim, forKey: nil)
        
        // 3>添加完成监听的方法
        anim.completionBlock = {_,_ in
            self.removeFromSuperview()
        }
    }
    // MARK: - 显示部分的动画
    // 当前视图
    func showCurrentView() {
        // 1> 创建动画
        let anim = POPBasicAnimation(propertyNamed: kPOPViewAlpha)
        
        anim?.fromValue = 0
        anim?.toValue = 1
        anim?.duration = 0.25
        
        // 2> 添加到视图
        pop_add(anim, forKey: nil)
        
        //3> 添加按钮的动画
        showButton()
    }
    // 弹力显示所有的按钮
    func showButton() {
        // 1. 获取scrollView的子视图的第0个视图
        let v = scrollView.subviews[0]
        
        // 2.遍历V中的所有按钮
        for (i,btn) in v.subviews.enumerated() {
            // 1> 创建动画
            let anim = POPSpringAnimation(propertyNamed: kPOPLayerPositionY)
            // 2> 设置动画属性
            anim?.fromValue = btn.center.y + 400
            anim?.toValue = btn.center.y
            
            // 弹力系数取值范围0-20 ，数值越大，弹性越大默认是4
            anim?.springBounciness = 8
            // 弹力速度，取值范围0-20，数值越大，速度越大，默认数值为12
            anim?.springSpeed = 8
            
            // 设置动画启动时间
            anim?.beginTime = CACurrentMediaTime() + CFTimeInterval(i)*0.025
            // 3> 添加动画
            btn.pop_add(anim, forKey: nil)
        }
    }
    
}
// private 让extension 所有的方法都是私有的
extension WBComposeTypeView{
    func setupUI() {
        // 0.强行更新布局
        layoutIfNeeded()
        // 1.向scrollVIew添加视图
        let rect = scrollView.bounds
        let width = scrollView.bounds.width
        for i in 0..<2 {
            let v = UIView(frame: rect.offsetBy(dx: CGFloat(i)*width, dy: 0))
            // 2.向视图添加按钮
            addButton(v: v, idx: i*6)
            // 3.将视图添加到scrollView
            scrollView.addSubview(v)
        }
        // 4.设置scrollView
        scrollView.contentSize = CGSize(width: 2*width, height: 0)
        scrollView.showsVerticalScrollIndicator = false
        scrollView.showsHorizontalScrollIndicator = false
        scrollView.bounces = false
        
        // 禁用滚动
        scrollView.isScrollEnabled = false
    }
    // 向 v中添加按钮，按钮的数组索引从idx开始
    func addButton(v: UIView, idx: Int) {
        let count = 6
        // 从idx开始，添加6个按钮
        for i in idx..<(idx + count){
            if i >= buttonsInfo.count {
                break
            }
            // 0> 从数组字典中获取图像名称和title
            let dict =  buttonsInfo[i]
            
            guard let imageName = dict["imageName"],
                let title = dict["title"] else {
                    continue
            }
            // 1> 创建按钮
            let btn = WBComposeTypeButton.composeTypeButton(imageName: imageName, title: title)
            // 2> 将btn添加到视图
            v.addSubview(btn)
            // 3> 添加监听方法
            if let actionName = dict["actionName"] {
                // oc 中使用NSSelectorFromString()
                btn.addTarget(self, action: Selector(actionName), for: .touchUpInside)
            } else {
                // FIXME: -
                btn.addTarget(self, action: #selector(clickButton), for: .touchUpInside)
            }
            // 4> 设置要展现的类名 - 注意不需要任何判断，有了就设置，没有就不设置
            btn.clsName = dict["clsName"]
        }
        // 2. 遍历视图的子视图，布局按钮
        // 准备常量
        let btnSize = CGSize(width: 100, height: 100)
        let margin = (v.bounds.width - 3 * btnSize.width) / 4
        
        for (i, btn) in v.subviews.enumerated() {
            
            let y: CGFloat = (i > 2) ? (v.bounds.height - btnSize.height) : 0
            let col = i % 3
            let x = CGFloat(col + 1) * margin + CGFloat(col) * btnSize.width
            
            btn.frame = CGRect(x: x, y: y, width: btnSize.width, height: btnSize.height)
        }
    }
}

